JPH05131956A - Steering part structure of walk type working machine - Google Patents

Abstract

PURPOSE:To avoid possibility of a working machine running and approaching a driver even when a handle is unexpectedly raised during reversing. CONSTITUTION:A walk type tiller is provided with a main clutch lever 8 protruded to a position above a steering handle 5 and an auxiliary clutch lever 9 protruded to a position below the steering handle 5 and formed such that the auxiliary clutch lever 9 and a main clutch are intercoupled so that the main clutch is disengaged through downward rocking of the auxiliary clutch 9. In the walk type tiller, the auxiliary clutch lever 9 is formed in a wide semiloop-form shape spanning a space between right and left handle levers 6 and 6. The lateral lever 9Y of the auxiliary lever 9 is formed in a stepped shape in which an intermediate part 9y between the right and the left is protruded frontward from right and left end parts 9s.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control structure of a walking type working machine such as a walking type cultivator equipped with a rotary cultivating device, and more particularly, to an unexpected handle rise due to a torque reaction force when moving backward. Regarding the technology to deal with.

[0002]

2. Description of the Related Art In a walk-behind work machine, a work device is generally attached to either the front or the rear of a drive traveling wheel, and a steering wheel operated by an operator is generally extended rearward of the work machine. When working, the operator holds the rear end of the steering wheel and walks from behind. The traveling clutch lever that controls the traveling and stopping of the working machine is attached to the steering handle in an upright posture so that it can be easily operated.

[0003]

By the way, even when the vehicle is temporarily moved backwards due to alignment or switch back turn, the vehicle will travel backwards in the same state as when it was moved forward. Since the rear part of the fuselage, that is, the steering handle tends to lift up,
The pilot walks backward while pressing the handle downward. When the vehicle is traveling backwards and the traveling ground is clay, the driving reaction force larger than expected will act on the steering wheel, and it will not be possible to hold the steering wheel, which may cause an unexpected lifting of the steering wheel. If the handle is lifted, the traveling clutch lever cannot be operated,
There was room for improvement because the undesired state in which the work implement approached the operator could occur. An object of the present invention is to prevent the above-mentioned unfavorable state from occurring even if the handle is unexpectedly lifted by devising the structure of the control portion.

[0004]

In order to achieve the above object, the present invention provides an auxiliary clutch lever for operating a traveling clutch, which is separate from a traveling clutch lever equipped so as to project above a steering handle in a walking type working machine. Is mounted on the lower side of the steering handle so that it can swing up and down, and the auxiliary clutch lever and the traveling clutch are linked so that the traveling clutch is disengaged by the downward swing of the auxiliary clutch lever. The lever is formed in a wide shape that straddles the left and right steering handles, and the lateral lever part of this auxiliary lever is set to have a stepped shape in which the middle part of the left and right sides protrudes forward more than the left and right end parts. It is characterized by being.

[0005]

Since the steering lever is provided with the auxiliary lever linked to the disengagement of the traveling clutch with the downward swinging movement, the traveling clutch can be disengaged by lowering the auxiliary lever. .. Therefore, if the steering wheel is unable to be fully held when the vehicle is moving backwards and the steering wheel rises unexpectedly, simply holding the auxiliary lever will cause the auxiliary lever to move relatively downward, causing the traveling clutch to disengage and drive. Since the force is eliminated, the handle can be lowered, and the backward movement of the working machine can be stopped, it is possible to effectively avoid an unfavorable state in which the working machine approaches the operator and return to the normal control posture. In addition, the auxiliary clutch lever is formed in a wide shape that straddles the left and right steering handles, and the lateral lever part of this auxiliary lever has a stepped shape in which the middle part of the left and right sides protrudes forward more than the left and right end parts. Since it is set to, interference in the front-back direction between the operator and the auxiliary clutch lever, which will be located in the middle of the left and right handlebars, is unlikely to occur, and the left and right ends of the auxiliary clutch lever are relatively rearward. Since it is overhanging and is in a position where it is easy to manually operate, it becomes easy to perform the gripping operation of the sword.

[0006]

As a result, the auxiliary clutch lever mounted on the lower side of the steering wheel can stop the progress of the aircraft by a simple operation of simply grasping the auxiliary clutch lever to prevent an unexpected rise of the steering wheel during reverse travel, thus improving safety. In addition, the auxiliary clutch lever could be arranged at a position where it could be operated manually without hindering the steering posture of the operator.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows a walk-type cultivator, which is an example of a walk-type working machine, in which 1 is an engine, 2 is drive wheels, 3 is a rotary cultivator, 4 is a mission case, and 5 is a steering wheel. As shown in FIG. 1, the steering handle 5 is configured by arranging a pair of left and right handlebars (corresponding to handle members) 6 in a V shape in a plan view, and a grip portion 7 of the right handlebar 6 is provided. A main clutch lever 8 and an auxiliary lever 9 formed of a bent pipe are attached to the front position of the.
As shown in FIGS. 2 to 4, the main clutch lever 8 in the upright posture is pivotally supported by a bracket 10 fixed to the handlebar 6 so as to be swingable around a horizontal swing axis P at the lower end portion thereof. , The main clutch (corresponding to a traveling clutch) 11 is engaged when the main clutch lever 8 swings forward, and the main clutch 11 is disengaged when swinging rearward so that the main clutch 11 is interlocked and coupled. . The auxiliary lever 9 in the hanging posture is swingable around the fulcrum axis X provided on the bracket 10 in the working traveling posture of the tiller, and the fulcrum axis X is located in front of the swing axis P. It is set in a close position. The auxiliary lever 9 is formed with an arm portion 9a extending above the fulcrum axis X,
The main clutch lever 8 and the auxiliary lever 9 are arranged relative to each other in a state where the arm portion 9a and the main clutch lever 8 are abuttingly interlocked with each other. The auxiliary lever 9 is urged in the counterclockwise direction by a tension spring 13 provided on the arm portion 9a and the handlebar 6, and normally swings upward to move the bracket 10 as shown in FIG. It is in a standby position in contact with the bent stop portion 10a. Further, the auxiliary lever 9 is, as shown in FIG.
6 is formed in a wide semi-loop shape across 6 and the lateral lever portion 9Y is connected to the operation portion 9 at the left and right end portions.
The left and right intermediate portions 9y are set to have a stepped shape protruding forward from s and 9s, and in the standby posture, the operation portions 9s and 9s, which are the tip portions with respect to the fulcrum axis X, are located below the handlebar 6. positioned. Reference numeral 14 is a cover member forming an operation path W of the main clutch lever 8.

To explain the operation, the main clutch lever 8 is operated to the clutch engaged position during the plowing work, and the auxiliary lever 9 is in the standby position at this time. When the main clutch lever 8 is operated to the disengaged position, the main clutch 11 is disengaged and the running wheels 2
When the cultivating device 3 and the cultivating device 3 are both stopped, and the lever is further operated to the braking position by the lever, the brake is applied. And
When the transmission (not shown) inside the transmission case 4 is operated to move backward, when the steering wheel 5 is not pressed down due to the torque reaction force of the traveling wheels 2 and the steering wheel rises unexpectedly, the handlebar 6 The operation of the main clutch lever 8 on the upper side is disabled, but at that time, either the left or right operation portion 9 of the auxiliary lever 9 on the lower side of the handlebar 6 is disabled.
When s is gripped, the auxiliary lever 9 swings relatively downward against the tension spring 13, and the arm portion 9a forcibly presses the main clutch lever 8 from the front to forcibly force the main clutch 11 to move. To turn off. In other words, by simply grasping the auxiliary lever 9 quickly, it is possible to automatically avoid the inconvenience that the steering wheel rises and the uncontrollable tiller approaches the operator. Further, depending on the positional relationship between the swing axis P and the fulcrum axis X, the auxiliary lever 9 and the main clutch lever 8
The distance L between the contact point A and the swing axis P changes so as to become smaller as the amount of downward swing operation of the auxiliary lever 9 increases, so that the auxiliary lever 9 in the standby position. The operation to start moving can be done lightly. It should be noted that as the main clutch lever 8 approaches the operation ending posture of the auxiliary lever 9 in the clutch disengaged position, a large amount of operating force is required for the auxiliary lever 9, but the lever operation is performed midway due to the momentum due to inertia after starting to move. It is operated to the operation end posture without stopping. By the way, the auxiliary lever 9 may be composed of a wide plate member.

As shown in FIG. 1, the handlebar 6 is composed of a main body portion 6A on the working machine side and a hand portion 6B inserted and connected to the rear end of the main body portion 6A. It is covered with a rubber cover 15 in a good appearance. Further, as shown in FIGS. 6 and 7, the left handlebar 6 is provided with a diff operating lever 16 for trailer work, and the guide plate 17 which is a bracket that also serves as a lever support is just provided. It is positioned so as to protect the inside of the rubber cover 15. Similarly, the guide plate 19 of the auxiliary transmission lever 18 attached to the right handlebar 6 is also positioned so as to protect the right rubber cover 15 from the inside.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan view of a steering wheel.

FIG. 2 is a partially cutaway side view showing a structure of a main clutch lever portion.

FIG. 3 is a partially cutaway plan view showing a structure of a main clutch lever portion.

FIG. 4 is a cross-sectional view showing the structure of the main clutch lever portion.

FIG. 5: Side view of walk-behind cultivator

FIG. 6 is a cross-sectional plan view of the middle portion of the left handle

FIG. 7 is a cross-sectional view of the middle portion of the left handle

[Explanation of symbols]

 5 Steering handle 6 Handle member 8 Traveling clutch lever 9 Auxiliary clutch lever 9Y Lateral lever portion 11 Traveling clutch

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sentaro Shiotani 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory

Claims (1)

[Claims] 1. An auxiliary clutch lever (9) for operating a traveling clutch is provided separately from the traveling clutch lever (8) equipped so as to project above the steering handle (5) so as to be vertically swingable. ), The auxiliary clutch lever (9) and the traveling clutch (11) are disengaged so that the traveling clutch (11) is disengaged by swinging the auxiliary clutch lever (9) downward. While being linked, the auxiliary clutch lever (9) is formed wide so as to straddle the left and right handle members (6), (6), and the lateral lever portion (9Y) of the auxiliary lever (9) is formed. ,
The structure of the control part of a walk-behind work machine in which the middle part on the left and right is set to have a stepped shape that extends forward of the left and right ends.